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I followed the guide from the Arduino website, by placing a 10uF capacitor between GND and Reset. However, now the voltage regulator only provides 4v (Vin=13V). It correctly has 5V when being powered via USB.

What happened? Isn't there a 10k resistor between +5V and Reset that should prevent the chip from being overloaded? Or did the Reset pin sink the entire energy of the capacitor?

  • Is there anything else plugged into the Arduino? – Majenko May 11 '17 at 20:25
  • Yes, but there wasn't any problems before. It's been working fine in full-time operation for several months, and all devices are powered by a seperate 7805. – user8437812 May 11 '17 at 20:35
  • How hot is the onboard LM1117 regulator? – Majenko May 11 '17 at 20:40
  • Yes, the LM1117 5.0 is very hot. But I'm not sure if this is because some component, e.g. the ATmega chip, or a capacitor, has failed, and therefore whether it makes sense to try to replace the regulator. – user8437812 May 11 '17 at 21:22
  • It sounds like the regulator may be going into thermal shutdown. Without the capacitor does it right itself? – Majenko May 11 '17 at 21:28

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